6-amino nicotinamide derivatives



Patented Aug. 14,1945

6-AM1N NICOTI NAMIDE DERIVATIVES William Braker,. Brooklyn, and Edward Pribyl, Astoria, N. Y., assignors to E. R. Squibb & Sons, -New York, N. Y., a corporation of New York No Drawing. Application October 2,1942, i

Serial No. 460,552

11 Claims. (01. zoo-239.6)

This invention relates to, and has for its object the provision of: [A] compounds of the main general formula CONE;

scum

wherein R represents a member of the class consisting of nitro, amino, (lower alkvl) -amino, and acyl-amino; [B] salt-type derivatives of these compounds; and [Cl methods of preparing com-" pounds [Al and [B]. v

The invention comprises especially compounds of the main general formula wherein R is in the para position with respect to the S02, and salttype derivatives thereof. The amino compounds of this type-notably fi-sulfanilamido-nicotinamide (or '5-carbamyl-sulfapyridine) and the salttype derivatives thereofare valuable chemotherapeutic agents.

The compounds of this invention may be prepared by condensing a nitro-phenyl-sulfonyl halide with 2-amino-5-cyano-pyridine, preferably in a pyridine-type reaction medium (e. g., pyridine, quinoline, or dimethylaniline), subjecting the resulting 2-(nitro-phenyl-sulfonamido) 5- cyano-pyridine to'a partial hydrolysis to obtain (besides the aforementioned simple salts) compounds wherein R is the amino group, a hydrogen of which is replaced by a salified radical of the following type, inter alia:

-min) n--COO-(a1ka1i metal) wherein n is an integer from 2 to 5 )lower alkyl) SO -(alkdli metal) alkylene- S02(a1kali metal) The following examples are illustrative of the invention.

EXAMPLE 1 6-(p nitro-phenyl-sulfonamido) nicotimzmide (a) 20 g. 2-amino-5-cyano-pyridine is dissolved in 200 cc. pyridine, 40 g. p-nitro-benzenesulfonyl chloride is added, and the solution is Preparation of heated at80 c. for 2.5hours and then poured into 10% hydrochloric acid. The resulting .precipitate, Z-(p-nitro phenyl-sulfonamido) -5-cyano-pyridine, is collected by suction filtration, washed with water,-and dried; and when crystallized: from acetone, it is obtainedas a; yellow crystalline material melting at 2171218 C. This 'product may be further purified by solution in dilute sodium hydroxide andprecipitation with acetic acid, being thereby obtained as a yellow the corresponding carboxylic acid amide, -and-- if the amino compound is desiredreducing the thus-obtained 6-.(nitr'o phenyl -sulfonamido) n'icotinamide to' the corresponding amino compound. Alternatively, the amino compounds may be prepared by condensing an amino-phenylsulfonyl halide (the amino group of which car- .ries a lower-alkyl or acyl substituent) with 2- amino-B-cyanO-pyridine, preferably in a Py dine-type reaction medium, subjecting the condensation product to a partial hydrolysis to ob.- tain theicorresponding carboxylic acid amide, and-if, a free amino compound is desiredhydrolyzing the thus-obtainable G-(acylaminophenyl-sulfonamido) -nicotinamidei The compounds of the main general formula form salts with bases (including organic bases) particularly alkalies-i. e., the alkali-metal (including ammonium) and alkaline-earth-metal bases; and those compounds of the main general formula wherein R is the amino group form water-soluble acid-addition salts with hydrochloric, sulfuric, nitric, and other acids commonlyused to solubilize amine bases;

powder melting at 224-225 0..

(b) 16 g. 2-(p-nitro-phenyl-sulfonamido) -5- cyano-pyridine is dissolved in cc. water con- .taining 2.7 g. sodium hydroxide, 28 cc. 30% hydrogen peroxide solution is added at" 50 0., and the resulting solution is heated at 7Q C. for 45 minutes. The reaction mixture is then acidified with acetic acid; and'the resulting precipitate, 6- (p-nitro-phenyl-sulfonamido) -nicotinamide, is

collected by suction filtration, washed with water,

and dried. The product melts at C.;- and when crystallized from alcohol, it is obtained as a yellow crystalline solid melting at 184-l85 C.

, EXAMPLE 2' t Preparation of 6-sulfanilamido-uicotinamide,

14 g. 6-(p-nitro-phenyl-sulfonamido) -nicotinamide is suspended in 440 cc. 95% alcohol, 36

, g. iron powder is added, followed by 2.8 cc. 18% hydrochloric acid, and the mixture is stirred and refluxed .for 8 hours. The reaction'mixture is then filtered, and the filter cake extracted with dilute ammonium hydroxide solution; and the {extracts are combined, and acidified with acetic The salt-type derivatives [Bl also comprisesacid. The resulting precipitate, fi-sulfanilamidonicotinamide, is collected by suction filtration, and washed with water; and when purified by crystallization from water, it is obtained as a light-bufi-colored crystalline material melting at 202.5-203 C.

EXAMPLE3 Preparation of the sodium salt of fi-sulfam'lamidonicotinamide EXAMPLE 4 Preparation of the hydrochloride of G-sulfanllamido-nicotinamide fi-sulfanilamido-nictoinamide is dissolved in absolute alcohol, an equivalent quantity of dry hydrogen chloride is added, and the hydrochloride of 6-sulfanilamido-nicotinamide is precipitated by adding ether (or by evaporating the alcoholic solution to dryness). An aqueous solution of the salt may be prepared without isolating the salt, by adding the 6-sulfanilamido-nicotinamide to a dilute aqueous solution of hydrochloric acid.

EXAMPLE 5 Preparation of the sodium salt of 6- ip-(a-sulfoethylaanino) -p"henyl-sul,fnamldo] -nz'cotinamide 10.5 g. fi-sulfanilamido-nicotinamide, 6.3 g. sodium acetaldehyde bisulfite (85%), and 25 cc. water are mixed together, and the mixture is gradually heated to 90 C. over a period of hour, while stirring. The resultant practically complete solution is filtered, and the filtrate is diluted with 300 cc. absolute'alcohol and cooled to 10 0.; and the precipitated salt is collected by suction filtration, and is purified by dissolving in 85% alcohol, filtering, and evaporating the *filtrate to dryness. (An additional quantity of the desired salt may be obtained from the filtrate of the precipitated crude salt by evaporating to dryness in vacuo.) The purified salt is a pale-yellow powder, which readily dissolves in water, yielding solutions having a pH of 5.2 (1%) and 5.1 Manifestly, other compounds of the main general formula and other salt-type derivatives may be obtained by using the appropriate equivalent, reactants in the procedure of the foregoing examples; and a variety of N -derivatives of 6-su1fanilamido-nicotinamideand corresponding derivatives of the other S-(amino-phenyl-sulfonamido)-nicotinamidesmay be obtained by procedures well known in the sulfanilamide-type compound art.

The following are further examples of compounds embraced by thi invention and of additional reactants.

COMPOUNDS 7 .N -succinyl-6-sulfanilamido-nico- 'o-Nitro-benzene-sulfonyl chloride m-Nitro-benzene-sulfonyl chloride m-Acetamino-benzene-sulfonyl chloride p-Methylamino-benzene-sulfonyl chloride p-Diethylamino-benzene-sulfonyl chloride The invention may be variously otherwise embodied within the scope of the appended claims.

We claim:

1. A compound of the group consisting of: compounds of the general formula -CONH wherein R represents a member of the class consisting of nitro, amino, (lower alkyl) -amino, and acyl-amino; and salts of these compounds.

2. A compound or the general formula CONE:

wherein R represents a member of the class consisting of nitro, amino, (lower allgyl) -amino, and acyl-amino.

3. A 3-carbamyl-6-(amlno-phenyl-sulfonamido) -pyridine.

4. 3-carbamyl-6-sulfanilamido-pyridine.

5. An alkali salt of a 3-carbamyl-6-(aminophenyl-sulfonamido) -pyridine.

6. An acid-addition salt of a 3-carbarnyl-6- (amino-phenyLsulfonamido) -pyridine.

7. The sodium salt of 3-carbamyl-6-sulfanilamido-pyridine.

8. The method of preparing a compound of the general formula -o' ONH:

S OiNH wherein R represents a member of the class consisting of nitro, amino, (lower alkyl) -amino, and acyl-amino, which comprises condensing a member of the group consisting of nitro-phenyl-sulfonyl halides, acylarnino-phenyl-sulfonyl halides, and [(lower alkyl) -amino]-phenyl-sulfonyl halides, with 2-amino-5-cyano-pyridine, and subjecting the condensation product to a partial hydrolysis to obtain the corresponding carbamide.

9. The method of preparing a compound of the general formula CONH:

S OaNH wherein R represents a member of the class consisting of nitro, amino, (lower'alkyl) -amino, and acyl-amino, which comprises condensing a. member of the group consisting of nitro-phenyl-sulfonyl halides, acylamino-phenyl-sulfonyl halides, and [(lower alkyll-aminol-phenyl-sulfonyl halides, with 2-amino-5-cyano-pyridine in a pyridine-type reaction medium, and subjecting the condensation product to a partial hydrolysis to obtain the corresponding carbamide.

10. The method which comprises condensing a nitro-phenyl-sulfonyl halide with 2-amino-5- cyano-pyridlne, and subjecting the resulting 2- (nitro-ph'enyl-sulfonamido) -5-cya.no-pyridine to a partial hydrolysis to obtain the corresponding carbamide.

11. The method of preparing fi-sulfanilamldonicotinamide which comprises condensing pnitro-phenylsull'onyl halide with 2-amino-5-' cyano pyridine, subjecting the resulting 2-(pnitrophenyl-sulfonamido) -5-cya.no-pyridine to a partial hydrolysis to obtain the corresponding carbamide, and reducing the resulting, 6- (p-nitrophenyl-sultonamido) -nicotinamide to the spending amino compound.

corre- 

